5x^2-9x+14=3x^2+2x-1
5x^2-9x+14=3x^2+2x-1 Х=15 -. -- - 7
5х^2-9x+14=3x^2+2x-1
5x^2-9x+14-3x^2-2x+1=0
2x^2-11x+15=0
D=b^2-4ac= (-11)^2-120= 121-120=1
X1,2= -b+- \sqrt{D} /2a
X1,2= 11+- \sqrt{1} /2•2
X1,2= 11+-1 /4
x1= 3, x2=2,5